Low Power IF Digitizing Subsystem
The high dynamic range and inherent anti-aliasing provided by the bandpass sigma delta converter allows the AD9874 to cope with blocking signals 95 dB stronger than the desired signal. Auxiliary blocks include clock and LO synthesizers in addition to a serial peripheral interface port.
The SPI port programs numerous parameters of the AD9874, thus allowing the device to be optimized for any given application. Programmable parameters include synthesizer divide ratios, AGC attenuation and attack/decay time, received signal strength level, decimation factor, output data format, 16 dB attenuator, and the selected bias currents. The bias currents of the LNA and mixer can be further reduced at the expense of degraded performance for battery-powered applications.
- Multimode Narrow-Band Radio Products Analog/Digital UHF/VHF FDMA Receivers TETRA, APCO25, GSM/EDGE
- Portable and Mobile Radio Products
- Base Station Applications
- SATCOM Terminals
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
The AD9864/AD9874-EBZ evaluation board and its accompanying software provide a simple means to evaluate this highly integrated IC. The AD9864 and AD9874 are general-purpose IF subsystem that digitizes a low level 10 MHz–300 MHz IF input with signal bandwidths ranging from 6.8 kHz to 270 kHz. The AD9864/AD9874-EBZ is a flexible design that allows the user to configure it for different potential applications. In the IF input signal path, component pads are available to implement different IF impedance matching networks. The LO and CLK signals can be externally applied or internally derived from on-board VCO circuits . The reference for the on-chip LO and CLK synthesizers can be applied via the external FREF input or an on-board 26 MHz crystal oscillator (XO).
The evaluation board is designed to interface to Analog Devices high speed converter evaluation platform (HSC-ADC-EVALCZ) for data capture and control but can easily be interfaced to other FPGA, DSP or micro-controller development platforms via its general purpose connector. A simple software SPI control GUI provides an easy means of configuring the AD9864/AD9874. Analog Devices VisualAnalog software is used for real time data analysis.
MS-2735: Maximizing the Dynamic Range of Software-Defined Radio
Low-Power IC Digitizes 300 MHz IF
This flexible IF digitizer IC can capture signal band-widths as wide as 270 kHz with better than 90-dB dynamic range....
Designing Power Supplies for High Speed ADC
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.